-------------------------------------------------------------------------------- KRAKATAU Indonesia 6.10°S, 105.43°E; summit elev. 813 m; All times are local (= UTC + 7 hours) Reports from 2001: | March | April | July | September | Reports from 2002: | September | Reports from 2003: | March-April | March-April | Reports from 2004: | July | Reports from 2005: | April | Krakatau Eruptive History Information from the USGS Global Volcanism Program -------------------------------------------------------------------------------- 21-27 March 2001 Anak Krakatau showed a significant increase in activity during the week of 12-18 March. The number of shallow volcanic earthquakes (type B) rose to 79 from 25 the previous week. Activity decreased again during 19-26 March, with only 34 shallow volcanic events. Krakatau is at hazard level 2 (on a scale of 1-4). Source: Volcanological Survey of Indonesia -------------------------------------------------------------------------------- 4-10 April 2001 The VSI reported that Anak Krakatau showed an increase in seismic activity during 27 March- 1 April in comparison to the previous week. The seismographs detected seven deep volcanic, 54 shallow volcanic, and seven tectonic earthquakes. Krakatau is at alert level 2 (on a scale of 1-4). Source: Volcanological Survey of Indonesia -------------------------------------------------------------------------------- 18-24 July 2001 There were 728 shallow volcanic earthquakes at Krakatau during 9-15 July, which was a significant increase in comparison to the previous week. No visual observations were made. The volcano remained at Alert Level 2 (on a scale of 1-4). Source: Volcanological Survey of Indonesia -------------------------------------------------------------------------------- 12-18 September 2001 In comparison to the previous week there was a significant increase in explosion and volcanic earthquakes at Krakatau during 3-9 September. The number of small explosion earthquakes sharply decreased. The volcano remained at Alert Level 2 (on a scale of 1-4). Source: Volcanological Survey of Indonesia -------------------------------------------------------------------------------- 19-25 September 2001 The number of explosion earthquakes decreased significantly during 10-16 September in comparison to the previous week, while the number of small explosion earthquakes increased. The volcano remained at Alert Level 2. Source: Volcanological Survey of Indonesia -------------------------------------------------------------------------------- 4-10 September 2002 Volcanic activity at Krakatau was at low levels from May until mid-August when the number of daily seismic events increased. There was no corresponding increase in surface activity. The Alert Level was raised from 1 to 2 (on a scale of 1-4). Source: Volcanological Survey of Indonesia -------------------------------------------------------------------------------- 26 March-1 April 2003 During 17-23 March, seismicity at Krakatau was dominated by volcanic earthquakes and there was a significant increase in the number of shallow events. No visual observations could be made due to inclement weather. Krakatau remained at Alert Level 2 (on a scale of 1-4). Source: Volcanological Survey of Indonesia -------------------------------------------------------------------------------- 2-8 April 2003 During 24-30 March there was a significant decrease in the number of earthquakes at Krakatau in comparison to the previous week. The number of shallow volcanic earthquakes decreased the most; 58 occurred during 17-23 March, whereas 12 occurred during the report period. Krakatau remained at Alert Level 2 (on a scale of 1-4). Source: Volcanological Survey of Indonesia -------------------------------------------------------------------------------- 14-20 July 2004 In July there was an increase in the number of gas-and-steam emissions from the crater of Anak Krakatau. In addition, the number of volcanic earthquakes increased from 1-4 per day before 5 July, to ~57 per day, then dropped to 2-17 earthquakes per day by mid-July. The Alert Level at Krakatau was raised from 1 to 2 (on a scale of 1-4). Visits to the crater were prohibited. Source: Directorate of Volcanology and Geological Hazard Mitigation -------------------------------------------------------------------------------- 6-12 April 2005 On 13 April at 0800, DVGHM raised the Alert Level at Krakatau to 2 (on a scale of 1-4). Source: Directorate of Volcanology and Geological Hazard Mitigation